1. Department of Gastroenterology and Hepatology; Tokyo Medical University Hospital; Tokyo Japan
2. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
3. Division of General Surgery; Lin-Kou Chang Gung Memorial Hospital; Tauyuan Taiwan
4. Department of Gastroenterological Surgery; Yokohama City University Graduate School of Medicine; Kanagawa Japan
5. Department of medical informatics; Niigata University; Niigata Japan
6. Department of Surgery; Yuan's General Hospital; Kaohsiung Taiwan
7. Department of Internal Medicine; National Taiwan University Hospital; National Taiwan University College of Medicine; Taipei Taiwan
8. Center for Global Health Mito Kyodo General Hospital University of Tsukuba; Ibaraki Japan
9. Department of General Internal Medicine; Japanese Red Cross Nagoya Daini Hospital; Aichi Japan
10. Department of Gastroenterology; Ogaki Municipal Hospital; Gifu Japan
11. Second Department of Surgery; Wakayama Medical University School of Medicine; Wakayama Japan
12. Emeritus Professor; Graduate School of Medicine; Chiba University; Chiba Japan
13. Department of Surgery; Institute of Gastroenterology; Tokyo Women's Medical University; Tokyo Japan